Medieval Cologne? [解決]

Hi, i suppose this is from Cologne, i ask if someone can give me a complete identification.

Thanks

w = 1,25 - d = 18 mm

Certainly it is in the style of an Ottonian denar of Cologne, but I have not yet matched the obverse inscription.

Edit:  Perhaps a legend variant of this:  Denier - Immobilization in the name of Otto III (Soest mint) - Holy Roman Empire – Numista

This one may have a closer match to the legend: https://www.acsearch.info/search.html?id=2188859

It looks like having both O in COLONII with points is unusual.

Thank you. Do you know what does legend mean? Or maybe do you know some site or book where i can check?

Obverse legend is a corrupted version of OTTO IMPERATOR (Emperor Otto)

I believe reverse legend is abberviation of SANCTA COLONIA (Blessed Cologne or similar).

I don't know the reference books / websites for Germany, but maybe the referee for German States will see this and can comment.  

S / COLONII / A - Sancta Colonia Agrippina (source)